Calculating machine



June 27, 1944. FR'DEN 2,352,376

CALCULATING MACHINE Filed May 19, 1942 14 Sheets-Sheet l FlE L anunu CLEAR INVENTOR J CARL M. FR/DEN 9 L ATTORNEY June 22?, 1944. E'fMI'FF'aIrJm; 2,352,376

CALCULATING MACHINE Filed May 19, 1942 14 Sheets-Sheet 2 INVENTOR CARL M. FR/DEN ATTO R N EY June 27, 1944; c. M. FRIDEIN CALCULATING MACHINE Filed May 19 1942 14 Sheets-Sheet 5 Mum INVENTOR CARL M.F/?/DEN BY 40 M) MW ATTORNEY June 27, 1944. c. M. FRIDEN CALCULATING MACHINE Filed May 19, 1942 14 Sheets-Sheet 4 Zmnentor CARL M. FR/DEN Cittorneg June 27, 1944. Q M FRHDEN CALCULATING MACHiNE Filed May 19, 1942 14 Sheets-Sheet 5 \m, w o @JEF 4- INVENTOR CARL M. FR/DEN E m-Him.

ATTORN EY June 27, 1944. c. M. FRIDEN CALCULATING MACHINE Filed May 19, 1942 14 Sheets-Sheet 6 :vm d w W Wm M m y m EU 0 M C 8% M NMN 242g! \GN AWQQN 4w mam & /MMW Mn v HUH m-HHhH QN June 27, 1944. v c, FRlDEN 2,352,376

CALCULATING MACHINE- Filed May 19, 1942 14 Sheets-Sheet 7 g I "'1 i I [U E CARL M. FRIDEN ATTORNEY June 27, 1944. c FRlDEN CALCULATING MACHIQEV Filed May 19, 1942 14; Sheets-Sheet 8 INVENTOR CARL M. F'R/DEN ATTORN EY June 27, 1944. M FRlDEN CALCULATING MACHINE 14 Sheets-Sheet 9 Filed May 19, 1942 INVENTOR CARL M. FR/DEN v MM ATTORN EY June 27, 1944. c. M. FRIDEN CALCULATING MACHINE Filed May 19, 1942 14 Sheets-Sheet 10 ATTORNEY wmw June 27, 1944. c. M. FRIDEN CALCULATING MACHINE Filed May 19, 1942 14 Sheets-Sheet ll INVEN'I'OR CARL M. FRIDEN ATTORNEY June 27, 1944. c. M. FRIDEN 2,352,376

. CALCULATING MACHINE Filed May 19, 1942 14 Sheets-Sheet 12 1 INVENTOR CARL M FR/DEN ATTORNEY June 27, 1944. c. M. FRIDEN CALCULATING MACHINE Filed May 19, 1942 14 Sheets-Sheet l3 mvnwon CARL F7. FR/[JEN BY W ATTORNEY June 27, 1944. c. M. FRIDEN CALCULATING MACHINE Filed May 19, 1942 14 Sheets-Sheet 14 -HH v U nHI -H 1H ISnncntor ZIIDEN (Ittorneg Patented June 27, .1944

CALCULATING MACHINE Carl M. Friden, Pleasanton, Calif., ,assignor to Friden Calculating Machine Co., Inc., a corporation of California Application May 19, 1942, Serial No. 443,549

4 Claims.

This invention relates to calculating machines of the character adapted to perform addition, subtraction, multiplication and division, and is concerned more particularly with the provision of improved means for controlling shifting of the carriage in multiplying operations.

It is a general object of the invention to provide improved means for controlling carriage shifting in multiplying operations.

Another object of the invention is to provide an improved control mechanism for a multiplying calculator in which the initial positioning of thecarriage to start the multiplying operation controls the direction of shifting of the carriage during the multiplying operation.

, Other objects and advantages of the invention will be apparent from the following description of a preferred embodiment, as illustrated in the accompanying drawings, in which:

Figure 1 is a fragmentary plan view of a calculating machine embodying the invention;

Figure 2 is a longitudinal sectional elevation of the rear portion of the machine taken as indicated by the line 2-2 in Figure 1;

Figure 3 is a fragmentary sectional elevation of a part of the tabulating mechanism, taken as indicated by the line 3-3 in Figure 1;

Figure 4 is a plan view of the body of the machine with certain parts omitted and others shown in section, illustrating the drive arrangement and certain controlling connections in the machine;

Figure 5 is a rear elevational view of the machine with certain parts in section, the view being taken as indicated by the line 5-5 in Figure 1;

Figure 6 is a detailed view of certain parts shown in Figure 5;

Figure 7 is a perspective view of certain of the parts shown in Figure 5;

Figure 8 is a longitudinal view partly in section illustrating the clutch and certain parts of the shift and tabulating control, the view being taken as indicated by the line 8-8 in Figure 1;

Figure 9 is a sectional elevational view of the machine taken as indicated by the line 9-9 in Figure 1;

Figure 10 is a perspective view of certain of the shift control parts;

Figure 11 is a longitudinal elevational view with certain parts shown in section, the view being taken as indicated by the line H-l lin Figure 1;

Figure 12 is a schematic operational view showing parts of the tabulating mechanism.

Figure 13 is a view similar to Figure 12 but showing the parts in a difl'erent operative position;

Figure 14 is a view similar to Figures 12 and 13 showing the parts as positioned near the end of a tabulating operation;

Figure 15 is a view similar to Figure 14 but showing the parts as positioned with the carriage entering its tabulated position;

Figure 16 is a side elevational view of the multiplier mechanism taken as indicated by the line l6-l6 in Figure 1;

Figure 17 is a similar view to Figure 16 but has certain parts omitted to illustrate details of construction;

Figure 18 is an elevational view with certain parts in section, the view being taken as indicated by the line l8-ll in Figure 1;

Figure 19 is an operational view of the multiplier mechanism representing the condition of the parts with the multiplier key depressed to start a multiplying operation;

Figure 20 is a view of the parts similar to Figure 19 but showing the parts as positioned near the end of a multiplying operation;

Figure 21 is a detailed view 01' a part of the shift control mechanism taken as indicated by the line 2l-2l in Figure 5;

Figure 22 is a detailed view of certain parts of the shift control mechanism taken as indicated by the line 22-22 in Figure 5; 1

Figure 23 is a schematic rear elevational vie of the shift control mechanism;

Figure 24 is a detailed view of part of the shift control mechanism taken as indicated by the line 24-24 in Figure 23.

The invention is disclosed as embodied in a calculating machine having actuating mechanism of the uni-directional, continuous drive cycle type wherein all power driven operations are effected by engagement and disengagement of a single clutch providing the only path of power flow from the motor of the machineto the motor driven parts thereof. A calculating machine of this construction is disclosed in the copending applications of Carl M. Friden; Serial No. 42,268, filed September 26, 1935, which matured into Patent No. 2,310,281, dated February 9, 1943, and Anthony B. Machado, Serial No. 409,955, filed September 8, 1941.

The frame of the machine includes a base in (Figure 2) on which left and right side frame plates I2 and I3 are mounted within casing ll. Side plates l2 and i3 may be connected by cross brackets l6, l1, I8 and 19 (Figures 2 and 4) which serve to support various mechanisms of the machine. The register carriage 22 (Figures 1 and 2) which supports the accumulator and the revolutions counter is suitably mounted on the frame brackets I and I! for endwise shifting movement laterally of the machine in either direction to various ordinal positions as controlled by means described hereinafter.

Carriage 22 (Figure 2) includes a frame 3i on which the numeral wheel shafts 02 are journalled to carry numeral wheels 32 of conventional construction. Numeral wheels 20 have projecting twirler knobs 00a for manual setting thereof. To transmit increments of value to numeral wheels 02, each shaft 02 extends below the frame 01 and has a ten-tooth gear 24 which is actuated by means later described.

Accumulator resetting means Means are provided on the carriage for resetting the numeral wheels 20 (Figure 2) to zero registration including means such as rack bar 4| mounted for endwise sliding movement in the carriage frame adjacent the upper end of the numeral wheel shafts 02 for cooperation with mutilated gears 42 carried by numeral wheel shafts 32. Adjacent gears 42 are axially offset to cooperate with the adjacent vertically offset racks formed on rack bar 4| in the usual manner. When rack bar 4| is moved from its normal position to which it is spring urged in the usual manner, it will engage the gear 42 of a numeral wheel 00 displaced from the zero position and reset the numeral wheel to such position. Rack 4| carries a handle 44 (Figure 1) for manual operation and may be connected to an-actuating bar 42 for power operation. Bar 43 is suitably mounted for sliding movement on the carriage frame II and may be selectively coupled with rack bar 4|. This mechanism is disclosed and claimed in the copending application of Carl M. Prideu, Serial No. 240,269, filed November 14, 1938, which matured into Patent No. 2,294,083, dated August 25, 1942.

Drive, selecting, and actuating mechanisms The values to be introduced into numeral wheels 03 are selected by means of a plurality of banks or orders of settable value keys BI (Figures 1 and 2) of conventional construction. Keys H are mounted for endwise sliding movement and are adapted to be latched in depressed position by a latching bar 62 associated with each bank of keys 0| and adapted to be operated to release a depressed key by zero key 63 in each order. All of the orders of keys can be released simultaneously by the operation of a key releasing gate (not shown) extending along the front edge thereof in the usual manner.

The keys II (Figure 2) cooperate with selecting mechanism including spring urged selecting slides 00 mounted for endwise movement to position gears is selectively with respect to the stepped teeth of the associated actuating cylinders 10. Cylinders for adjacent orders are mounted on actuating shafts 1| (Figures 2 and 4) having suitable bevel gear connections with a transverse drive shaft 12 which is suitably journaled in side plates I2 and I3.

Shaft 12 and shafts H are driven cyclically from motor 10 through clutch 14 (Figures 4 and 8) which may be driven by suitable gearing 15. Clutch control lever 19 is pivoted on side plate II tmdetermine engagement or disengagement of the clutch by releasing or engaging the nose of dog 11 in the full cycle position thereon.

The number of increments transmitted to a gear 05 (Figure 2) by a cylinder 10 during cyclic operation of the clutch is transmitted to a square shaft 8I which carries each ordinal pair of gears 00 and extends rearwardly of the machine in the usual manner. Each shaft 8| carries a spool 02 having bevel gears 83 and 04 for cooperation with the aligned numeral wheel gear 34.

The engagement of gears 03 and 84 with gears 34 is controlled by strap 00 positioned between the gears and mounted by suitable arms 05 for rocking movement with shaft 01. Thus, rocking of shaft 01 determines transmission of said increments to the numeral wheels and also the direction of entering thereon. Any suitable control means such as plus key 08 (Figure 1) and minus ke 09 may be provided for rocking the shaft 01 to cause positive and negative registration as shown in Patent No. 2,229,889, dated January 28, 1941. Shaft 01 may be centralized by a pair of spring-urged centralizing arms 9| (Figure 2) cooperating with a central stop 92 and engaging a pin 93 carried by one of arms 05.

Revolutions counter mechanism The revolutions counter may comprise numeral wheels SI (Figure 2) on shafts 52 which may be reset to zero by rack bar 53 similar to the rack bar 4I described above. Rack bar 53 carries handle 40 (Figure l) for manual operation and may be selectively connected to actuating bar 43 as described in said Patent No. 2,294,083.

The numeral wheels 5i (Figure 2) are actuated by means of a conventional actuator 54 mounted on shaft 05 which is rocked from drive shaft 12 through a spring connection in a clockwise direction from the position shown in Figure 2 into operative engagement with the aligned numeral wheel 0|, and then is translated axially to effect entry of the digit. This structure is disclosed and claimed in my copending application Serial No. 370,256, filed December 16, 1940. When no count is to be made, the clockwise rocking move ment may be restrained by means of a neutralizing finger 50 (Figure 9) carried by a slide 51 guided on cross bracket I1 and pivotally connected to plus-minus gate or strap to be controlled thereby. In the central neutral position of strap 86, finger 58 underlies arm 58 of the counter actuator and thereby blocks rocking movement thereof.

Carriage shilt mechanism The carriage can be shifted selectively in either direction by power driven means controlled by manually operable keys, and this mechanism is of conventional construction. Carriage 22 is provided with toothed shift rack IOI (Figures 2 and 5) along the rear side thereof for cooperation with shift pins I02 on shift gear I03. Shift gear I03 (Figures 4 and 5) can be rotated in either direction and receives one-half rotation for each rotation of the clutch referred to above. For this purpose the shift gear I03 is connected by suitable gearing I04 to respective gear sleeves I06, I01, the gearing being arranged so that the drive from gear sleeve I06 rotates gear I03 in one direction and th drive from sleeve I01 rotates gear I03 in the opposite direction. The respective gear sleeves I06, I01 (Figure 4) are slotted" for engagement by toothed collars I08, I09 mounted slidably but non-rotatably on the rearward ends of adjacent actuating shafts H.

The sliding movement of collars I08, I08 (Figure 4) is controlled through forks IIO by means of spring-urged rods III, II2 which extend forwardly of the machine and abut similar depending arms H3, H4 carried by shaft H6 and sleeve II1 mounted thereon. Adjacent side plate I3 (Figures 4 and 9) shaft H8 and sleeve II1 have upstanding arms I I8 and I I8 operated by suitable rollers I 23 on shift keys HI and I22 so that selective depression of the keys controls the direction of carriage shifting.

To enable the power drive shift keys HI and I22 (Figure 8) have respective pins I23 cooperating with lever I24 operatively connected by lever I28 to control contacts I21 of the motor drive, and connected by link I28 with clutch control lever 19. Thus, on depression of either of keys I2I or I22, the clutch is engaged and the motor circuit enabled.

From the foregoing, it is seen that the carriage can be shifted selectively in either direction.

Tabulation and dividend entry The tabulating and dividend entering mechanism is of the type disclosed in the copending application of Carl M. Friden and Anthony B. Machado, Serial No. 315,986, filed January 27, 1940, for Calculating machine," and operates to zeroize the registers as a preliminary to a division operation, and to effect entry of the dividend into the accumulator in any selected ordinal position which may be preset in accordance with the problem being solved, while suppressing the usual count made in the revolutions counter during entry of a number in the accumulator. After setting of the dividend into the keyboard, the

only other operation necessary is the depression of the dividend control means or key, after which the machine automatically operates to perform the above described functions. the desired ordinal position of the carriage for entry of the dividend having been preset in accordance with the number of quotient figures desired, or the desired position of the decimal point in the quotient.

The first operation wh ch occurs upon depression of the dividend key is a shifting of the carriage to its leftmost position if displaced therefrom for a power clearance operation.

Dividend or tabulating Item-Referring to Figures 1 and 8, dividend key I is mounted for endwise sliding movement in side plate I3 by means of pin I42 engaging a slot therein. Spring I43 urges key I4I to the raised position shown in Figure 8. The lower end of key I is provided with elongated slot I44 which is engaged by pin I46 carried at the end of lever I41 mounted on transverse shaft I48 (Figures 4 and 8),

Intermediate its ends, key I (Figure 8) is provided with latching face I ill for engagement by the latching end of a latch slide I52 mounted for endwise sliding movement on side plate I3 with its rear end pivotally sup orted on upstanding pivotally mounted arm I53. Spring I84 is associated with arm I53 to urge slide I82 to latching position. Thus, upon de ression of key I it is latched in depressed position, and it remains there until the end of the operation when delatching occurs by means described later.

Depression of key I serves to enable a shift of the carriage to the left, to enable a power clearance mechanism, to condition the shift to the right, to block out the counter actuator and to enable the drive.

The shift of the carriage to the left and the power clearance mechanism for the registers is enabled upon depression of key I4I (Figures 4 and 8) when the key operates through arm I41 III to rock theshaft I48 in a clockwise direction as viewed in Figures 2 and 8. Referring to Figure 2, shaft I48 carries an upstanding arm I88 which is connected to a rearwardly extending pusher link I81 by an eccentric pivot I88. Pusher link I51 carries a pin I88 cooperatively related with depending arm I8I secured on transverse shaft II8. Shaft II6, as previously described, carries a depending arm II 3 (Figure 4) which abuts the end of shift control rod II I for the shift drive connection to the left. Thus, upon depression of the dividend key the shift drive connection determining shifting to the left will be engaged by the above described linkage.

To enable the power driven resetting mechanism, pusher link I 81 (Figures 2 and 4) is provided with offset notched end I82 in operative pushing engagement with the end of control rod I88 for the power clearance drive. This engagement is maintained by the tension of spring I84 connected between pusher link I81 and arm I88. Asseen in Figure 4, rod I83 extends rearwardly and carries control fork I88 for shiftable drive establishing collar I81 having a slidable but nonrotatable driving engagement with one of the actuating shafts H, and being toothed for engagement with the slotted hub I88 of cam I88. As seen in Figure 5, cam I68 is operatively related with arm I1I to drive actuating slide I12 for power resetting, which in the leftmost position of the carriage is operatively related to arm I13 carried by actuating bar 43. The above de scribed mechanism forms part of a conventional power return clearance mechanism as described in said Patent No. 2,294,083.

From the foregoing itwill be seen that upon clockwise oscillation 'of shaft I48, as viewed in Figure 2, caused by depression of the dividend key, pusher link I81 operates to push rod I88 rearwardly against the tension of spring I14, and to thereby engage the drive connection between collar I 81 and hub I88, so that power resetting will occur when the carriage is in its leftmost position. The shaft I48 may be operated through a suitable linkage by return clear key I16, to perform a combined clearing and carriage shifting operation to place the carriage in its left hand position.

As previously stated, depression of the dividend key I4I also serves to block out the counter actuator and prevent operation thereof, and to condition the shift mechanism for shifting to the right at the end of the return-clear operation.

As seen in Figures 8 and 9, the lower end of dividendkey I is engaged in its uppermost position with a roller I8I carried by lever I82, pivoted at I83 on side plate I3. Lever I82 carries a roller I84 (Figure 9) operatively disposed beneath the forwardly extending ann I85 of a bellcrank I 88 (Figure 7) pivoted on shaft I81, which is suitably mounted on side plate I 31 The movement of bellcrank I86 is utilized to block the counter actuator from operation and also to condition the shift mechanism for shifting the carriage to the right at the end of the return-clear operation.

In order to block out the operation of the counter actuator by movement of the bellcrank I88 (Figure 9). the upright arm I88 of the bellcrank I86 carries a pin I88 operatively engaged with lever I88, pivoted at I9 on side plate I3. The upper end of lever I98 is pivotally connected at I82 with blocking slide I93 having projection I84 lying normally out of the path of oscillation of arm 58 of the counter actuator assembly.

, v I i counterclockwise rocking movement of bellcrank I86 operates through lever I90 to move the slide I93 and projection I94 thereof from the position shown in Figure 9 to that shown in Figure 14, where movement of the counter actuator to active position is prevented as previously explained in connection with the neutralizer slide 51.

In order to condition the shifting mechanism for tabulation to the right, arm I96 (Figures 5, 'l and 12) is formed integrally with bellcrank I86 and is pivotally connected at I91 to a link I98 extending rearwardly and riding on roller I99 on an arm 20I (Figures 5, 10 and 12) also pivoted on shaft I81. Arm 20I has an arm 203 connected thereon and is connected thereto by spring 202 so that arm 203 is biased to move with arm 20I. Shift engaging arm 203 has a curved upper end 204 operatively engaged with shift controlling fork IIO of the right hand shifting mechanism. Link I98 is adapted to be disposed between the roller I99 and a lever 206 (Figures 5 and 12) pivoted at 201 on bracket I6. Upright end 208 of lever 206 has slotted engagement with a stud 209 on bracket I6 and is spring-urged upwardly by spring 2I I,

In order to establish a driving relation between the lever 206 and arm 20I, link I98 is provided with a raised portion 2I2 which normally is disposed out of the path of the lever 206, as shown in dotted lines in Figure 12, but is moved into the position shown in Figure 13 upon depression of the dividend key, so that when the lever 203 is subsequently depressed, as later described. arm 20I is rocked to operate through spring 202 (Figure 13) to place a bias on arm 203 to enga e the shift clutch for determining shifting or tabulation to the right as later described.

The dividend key I also engages the clutch and enables the motor circuit. It will be recalled that shaft I48 (Figure 9) is rocked in a counterclockwise direction upon depression of the dividend key, and during such movement a depending arm 2I6 serves through its pin 2II to rock an arm 2I8 pivoted at 2I9 on side plate I3, and having an upstanding finger 22I operatively related with roller 222, carried at the lower end of le er I26 (Figures 8 and 9). Upon counterclockwise movement of arm 2I8 (as viewed in Figure 9) lever I26 (Figure 8) will be rocked in a counterclockwise direction to close contacts I21, and to operate through lever I24 and link I28 to move clutch control lever I9 from the position shown in Figure 6 to its clutch engaging position out of engagement with the clutch dog 11.

Thus upon depression of the dividend key I, the first operation which ensues is a shifting of the carriage to its leftmost position if displaced therefrom, where a clearing or resetting operation is performed on either or both of the accumulator and counter. The clearing of the registers occurs during a cycle of operation with the carriage in its leftmost position, as shown in Figure 5, where one of shift pins I02 is engaged in the endmost tooth space of shift rack IIII, which is formed in part by pawl 226, pivoted at 221 on the rack and urged against pin 228 by spring 229. With the carriage in the position shown, shift pin I02 during the clearing cycle, rotating in a clockwise direction serves to oscillate pawl 226 so that its extension 230 strikes end 208 of lever 206, and moves it downwardly, and this movement is utilized to initiate shifting of the carriage to the right to the selected position for entering the dividend.

At the beginning of the clear cycle, the parts are positioned as shown in Figure 12, where interponent arm I 98 has its projection 2I2 disposed between the end 208 of lever 206 and roller I88 on shift conditioning arm 20I. Thus, when pawl 226 moves downwardly, lever end 208 is depressed from the position shown in Figure 12 to that shown in Figure 13, when lever 20I operates through spring '202 to place tension on shift engaging arm 203. The movement of shift engaging arm 203 from the position shown in full lines in Figure 13 to that shown in dotted lines is delayed until the end of the cycle by interlock means associated with the shift engaging mechanism.

Referring to Figures 4 and 5, the interlock means comprises lever 23I, pivoted at 232 on rear frame bracket I6, and having a pair of upstanding pins 233 spaced from and disposed in the path of respective shift forks IIO carried by rods III and H2. As seen in Figure 4, when one shift fork is moved rearwardly to engage the corresponding shift drive connection, the opposite pin 233 moves into blocking engagement with the other shift fork IIO to prevent operative movement thereof until the other shift drive is disengaged. Inasmuch as the shift drive for deter mining shifting to the left remains engaged until rocking of pawl 226 during the clear cycle, initiation of the shift to the right by movement of shift rod II2 by the hooked end 204 of arm 203 cannot occur until the end of the resetting cycle.

During the resetting cycle, certain other conditionings are eiTected in the machine. As seen in Figures 5, 9 and 10, arm 20I has integrally formed therewith a bellcrank 236 and both arm 20I and bellcrank 236 are urged to the position shown in Figure 12 by spring 23] attached to arm 203 and to the frame. The movement of the bellcrank 236 with arm 20I from the position shown in Figure 12 to that shown in Figure 13 is utilized to condition the control for entering the dividend at the end of the shifting operation to the right, and for maintaining the shift engaged until the selected tabulated position is reached.

To latch the bellcrank 236 and arm 20I in the position shown in Figure 13, the lower horizontal arm of bellcrank 236 is provided with laterally extending ear 238 adapted for engagement with a seat in a latch lever 239, pivoted at 2 on side plate I3, and urged in a clockwise direction by spring 242. As shown in Figure 13, upon clockwise movement of arm 20I and bellcrank 236, they are latched in position by latch lever 239.

The movement of bellcrank 236 also serves to condition means for engaging the plus-minus gears to enter the dividend at the end of the shift operation. For this purpose the upper arm of bellcrank 236 (Figure 12) is pivotally connected to a link 246, which is pivotally connected at 241 with a depending arm 248 pivoted to an actuating slide 249 mounted for vertical sliding movement on side plate I3, by slotted engagement with respective pins 25I. As shown in Figure 12, depending arm 248 is normally to one side of an ear 252 of an arm 253 which forms part of a control to determine engagement of the plusminus gears for entry of a dividend. Arm 253 (Figures 5, 8 and 14) is pivoted on shaft I81 and has integrally formed therewith an arm 254 carrying a roller 256 abutting a latch lever 25'! pivoted on side plate I3 and urged in a clockwise direction by spring 258. As shown in Figures 13 and aaeasve 14, arm 248 is operatively related to ear 232 so that downward movement of slide 249 will opof during the resetting operation also determines release of the shift connection determining shifting to the left. For this purpose, bellcrank 26I (Figures and 9) is pivoted on shaft 81 and has one arm disposed beneath end 208 of lever 206. The depending arm of bellcrank 26I is pivotally connected to link 262 which has its forward end pivotally connected to depending arm 263 secured on transverse shaft 264 (Figures 4 and 9). Shaft 264 (Figures 2 and 4) carries an arm 266 which is slotted at its offset end to receive pusher link I51. Thus, counterclockwise movement of the bellcrank 26I, as viewed in Figure 9, moves link 262 forwardly to rock shaft 264 in a counterclockwise direction (in the clockwise direction as viewed in Figure 2) so that arm 266 lifts pusher link I51 against the urgency of spring I64 to move end I62 thereof out of engagement with push rod I63 for the clear mechanism, and to disengage pin I59 from arm I 8I of the control means for determining shifting to the left. In this manner, both the shift connection for left hand shifting and the drive connection for resetting are disabled during the cycle performing the resetting operation so that they can be disengaged near the end of such cycle.

} Tabulation control It will be recalled that when the right hand shift mechanism is acting as shown in Figure 13 by the dotted line position of shift control fork I I0, the control linkage therefor is latched in operative position by the engagement of latch 239 tabulated to the selected position, without entry of the dividend.

As seen in Figures 1, 2 and 3, the carriage 22 is provided with a series of tabulator keys 21 I, 212 numbered 0 and 2 to 9. Inthe first or leftinost position of the carriage zero tabulator key 212 is aligned with arrow 213 on the casing of the machine. Tabulator keys 21 I, 212 are mounted for vertical endwise movement in broached slots in carriage frame bar 214, and keys 21I can be latched in depressed position by spring urged latching slide 216 (Figures 2 and 3) which is adapted to engage over the tooth 211 of a depressed key. Zero key 212 provides a release key for any depressed key 21I which it may be desired to release in changing thefitting of the machine to cause positioning of the carriage in its rightmost position. In alignment with the 10 key 21I, a suitable fixed cam (not shown) is providedon the carriage which operates arm 282 (referred to hereinafter) irrespective of the de pression of 10 key 2. Thus, "10 key 21I is a dummy key provided merely for the operator's convenience. Latching slide 216 is maintained in position in the frame bar 214 by retaining bracket 218. Keys 2H and 212 are urged to their'raised positions by respective springs 219 associated therewith.

A depressed key 21I, as indicated in dotted lines in Figure 3, is adapted to engage a V- shaped laterally extending ear 29I of an arm 292, pivoted at 283 on frame bracket I9. As shown in Figure 3, in the leftmost position of the carriage, release key 212 is alig'nedwith thev extension 28I, andcorrespondingly, if the carriage is displaced one or more ordinal spaces from its leftmost position, the corresponding key 2 will engage the nose 28I and depress the arm 282. Adjacent its end, arm 282 (Figures 3 and 14) carries roller 284 which is disposed above the upper end of actuating slide 249. Thus, when the carriage shifts into a predetermined position, the actuating slide 249 is operated to move latch 239 from the position shown in Figure 14 to that shown in Figure 15, to release bellcrank 236 and arm 20I and thereby permit disengagement of the shift mechanism for shifting the carriage to the right. This operation will occur toward the end of the last shift cycle.

The downward movement of actuating slide 249. as the, carriage enters its selected position also serves to release spring actuated means for meshing the plus-minus gears, andfor releasing the dividend key. The downward movement oi slide 249 (Figure 14) acts through-interponent arm 248 and arms 253 and 264 to rock latching arm 251 in a counter-clockwise direction and thereby move its latching notch 29I out of the path of offset ear 292 of a bellcrank 293 pivoted on pin 294 on side plate I3. Bellcrank 293 is urged in a counterclockwise direction by a relatively strong spring 296 (Figure 8) and has its upper end formed as a cam nose 291 for operative engagement with a roller 298, carried at the lower end of-a lever 299 connected by a clutch 32I-322 (Fig. 5) to shaft 81, so that when lever 299 is rocked plus-minus gate 86 (Fig. 2) will be rocked therewith prior to the dividend entering cycle, when the amount set up in the keyboard will be entered as the dividend in the selected tabulated position of the carriage.

Movement of lever 299 also serves to actuate latch slide I52 (Figure 8) and thereby release the dividend key. It will be recalled that the dividend key serves to hold counter blocking slide in active position, and means is brought'into play to prevent movement of counter blocking slide I93 out of active position when the key is released. For this purpose the offset ear 232 (Figure 15) of bellcrank 293 moves downwardly in front of oflset ear 30I on lever I90, and maintains slide I93 in the position shown in Figure 15 during entering of the dividend.

The movement of bellcrank 293 which initiates the dividend entering operation also enables means for restoring such bellcrank to inoperative position. As shown in Fig. 11, the lower end of bellcrank 293 is connected by link 306 with an arm 301 pivoted on plate 300 and having its upper end normally disposed out of the path of a roller, 308, carried by"a gear 309 .on the transverse shaft 12. However, counterclockwise movement of bellcrank 293 serves through link 306 to move arm 301 into the path of roller 303, so that near the end of the dividend entering cycle of operation after entry of the dividend into the accumulator, roller308 rocks arm 301,-

and through link 306 oscillates bellcrank 293 in a clockwise direction so that latch 251 can again move to active position as shown in Figure 14. The return of bellcrank 293 also moves tooth 292 thereof out of engagement with tooth 30I so that lever I90 and link I93 can return to inactive position, as shown in Fig. 9. Arm 301 (Fig. 11) carries pin 3II normally positioned centrally of slot l2 in link ll! which is pivoted on pin I carried by link I20 (Fig. 8) oi! the drive controlling linkage. Movement of arm '20! clockwise in Fig. 11 positions pin 3 in the right hand end oi slot "2 to thereby maintain the parts in drive establishing relation irrespective 01 release of key "I in an early part of the cycle. Tabulation without dividend entering If desired. a control may be set whereby the carriage may be tabulated to a selected position without entering o! the dividend, for example, it the amount set in the keyboard is to be used as a constant divisor and the dividend is set in the acpivoted on side plate It. Lever 328 may be suitaasaave (Figure 16) carries pin at its lower end for cooperation with the associated selecting arm 400, which has its lower end pivoted on strap 4l0 secured on multiplier plate 402. Each arm is pivotally connected intermediate its ends to one of selecting stop links III which extend rearwardly of the machine between multiplier plate 402 and retaining strap 4 I 2 suitably secured in spaced relation thereon. Springs 3 are tensioned between strap 2 and links 41! and serve to urge links 4 to the inoperative positions thereof illustrated in Figure 16, with arms 409 engaging pins 408 on the multiplier keys.

Adjacent their rear ends each link 4 carries a flanged stud 4 which engages in a corresponding guide slot formed in the arcuate forward edge of guide plate S, which is suitably secured in spaced relation from multiplier plate 402. As seen in Figure 17, each link 4H has beveled stop end 4H, and ends 411 are positioned in an are for cooperation, when projected to active position, with a multiplier rack as described hereinafter.

From the above description, it appears that depression of a multiplier key ill serves to rock 

